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onsemi MC33375ST-3.3T3
- Part No.:
- MC33375ST-3.3T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33375ST-3.3T3.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,268
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Product details
Overview
MC33375ST-3.3T3 from onsemi is a micropower low-dropout linear voltage regulator delivering a fixed 3.3 V output at up to 300 mA, featuring logic-level ON/OFF control, 260 mV dropout at full load, 125 µA quiescent current in active mode, and thermal/current limiting protection. It is designed for battery-powered industrial and consumer systems where extended runtime and stable low-voltage supply are critical.
For engineers reviewing the MC33375ST-3.3T3 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout performance at 300 mA, ON/OFF control interface compatibility, thermal derating on SOT-223 PCB layouts, and minimum 0.33 µF output capacitance requirement for stability.
Technical Context
The MC33375ST-3.3T3 uses a PNP pass transistor architecture enabling ultra-low dropout (25 mV at 10 mA, 260 mV at 300 mA) and tight line/load regulation (≤10 mV and ≤25 mV respectively). Its internal reference is trimmed to ±2% over −40°C to +125°C, and it integrates thermal shutdown at 150°C with no hysteresis.
Control logic responds to TTL/CMOS-compatible input: VCTRL ≥ 2.4 V enables regulation; ≤ 0.5 V disables output. Quiescent current drops to 0.3 µA in OFF mode, while ground pin current remains stable across input voltage (2.5–13 V) and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30 V ±2% over −40°C to +125°C - ensures reliable 3.3 V rail for microcontrollers and sensors without external feedback. |
| Max Output Current | 300 mA - sufficient to power multiple low-power ICs (e.g., MCU + transceiver + sensor) from a single LDO. |
| Dropout Voltage | 260 mV at 300 mA - allows operation from 3.56 V input (e.g., single Li-ion cell post-protection), minimizing wasted headroom. |
| Quiescent Current | 125 µA (ON), 0.3 µA (OFF) - extends battery life in sleep-mode applications like wireless sensors and portable meters. |
| Line Regulation | ≤10 mV (2.5 V to 12 V input) - maintains output stability despite battery voltage sag or noisy DC-DC pre-regulator ripple. |
| Load Regulation | ≤25 mV (0–250 mA load step) - prevents brown-out during burst-mode digital activity (e.g., BLE transmission). |
| Ripple Rejection | ≥65 dB at 120 Hz - suppresses low-frequency noise from AC-DC adapters or switching supply coupling. |
Pinout & Package
SOT-223 package (Case 318E), thermally enhanced 4-pin surface-mount outline with exposed drain pad (Pin 2/4) acting as thermal and electrical ground path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (Vin) | Accepts 2.5–13 V DC input; requires local 0.33 µF bypass capacitor to minimize high-frequency impedance. |
| 2 | Ground (GND) | Main power ground and thermal sink; must be connected to large copper area per Figure 25 for >150 mW dissipation. |
| 3 | Output (Vout) | Regulated 3.3 V output; requires ≥0.33 µF ceramic/tantalum capacitor placed within 2 cm for stability. |
| 4 | ON/OFF Control | Active-high logic input: ≥2.4 V enables regulator; ≤0.5 V disables output and reduces IQ to 0.3 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Level ON/OFF Control | Direct interface with 3.3 V or 5 V microcontroller GPIO-no level-shifter required for enable/disable sequencing. |
| Stable with 0.33 µF Output Cap | Reduces BOM cost and board space vs. traditional LDOs requiring ≥10 µF; supports compact ceramic capacitors. |
| Thermal Shutdown (150°C) | Self-protecting under overload or poor heatsinking; output cycles on/off until junction cools-prevents permanent damage. |
| Current Limit (450 mA typical) | Prevents catastrophic failure during short-circuit events; limits peak stress on PCB traces and upstream power sources. |
| Pb-Free & AEC-Q100 Capable | Meets RoHS compliance and automotive qualification requirements when used as NCV33375ST3.3T3G variant. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with LCD, Bluetooth LE, and analog front-end. IC Role / Device Role / Timing Role: Primary 3.3 V supply for MCU, radio, and precision ADC-enables single-cell Li-ion operation down to 3.56 V. Use Value: 260 mV dropout and 125 µA quiescent current extend usable battery capacity by >18% versus standard LDOs. |
Use Scenario: DIN-rail mounted remote I/O node with isolated RS-485 and 24 V DC input. IC Role / Device Role / Timing Role: Local 3.3 V rail for FPGA configuration, EEPROM, and opto-isolator bias-immune to 24 V bus transients. Use Value: Internal current/thermal limiting eliminates need for external fuse or thermal cutoff in harsh factory environments. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Door module powering window motor driver, CAN transceiver, and touch sensor ASIC. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 5 V domain-controlled via MCU GPIO for power-state sequencing. Use Value: 0.3 µA OFF-mode current meets ISO 11898-2 standby leakage requirements (<10 µA total system). |
Use Scenario: Dual-supply meter with metrology SoC (3.3 V) and RF mesh radio (3.3 V), powered from 3.6 V lithium thionyl chloride battery. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator enabling 15-year battery life in pulse-read applications. Use Value: 125 µA active IQ and 0.3 µA shutdown IQ reduce average current draw to <1.2 µA in deep-sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 250 mA max output, 1.6 µA IQ (ON), 0.1 µA (OFF); SOT-23-5 package; no thermal shutdown. | Limited to lower-current loads; lacks overtemperature protection-requires external thermal monitoring in enclosed enclosures. | Preferred for space-constrained designs where 250 mA suffices and thermal risk is mitigated by mechanical design. |
| NCP1117ST33T3G | 1 A output, 6 mA IQ (ON), 0.5 mA (OFF); TO-220/SOT-223; 1.2 V dropout at 800 mA. | Higher power capability but 48× higher active IQ-unsuitable for battery lifetime-critical applications. | Selected when higher current headroom or legacy footprint compatibility is prioritized over quiescent power. |
Compared with MCP1700T-3302E/MB, MC33375ST-3.3T3 delivers 20% more output current and integrated thermal shutdown; versus NCP1117ST33T3G, it reduces active IQ by 48×-critical for multi-year battery operation.
Availability
MC33375ST-3.3T3 is available at Aetrix Electronics and suitable for portable medical devices, industrial automation controllers, and automotive body electronics requiring stable component supply with long-term manufacturability assurance.
Supply support for MC33375ST-3.3T3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC33375 series was developed to address ultra-low-power, high-stability regulation needs in battery-operated and thermally constrained systems-emphasizing micropower operation, robust protection, and minimal external components.
FAQ
What is the minimum input voltage required for MC33375ST-3.3T3 to maintain regulation?
The MC33375ST-3.3T3 requires a minimum input voltage of 3.56 V to sustain 3.3 V output at 300 mA load, based on its 260 mV dropout specification. At lighter loads (e.g., 10 mA), input can drop to 3.325 V (3.3 V + 25 mV). Operation below 2.5 V input is not supported per absolute maximum ratings.
Can MC33375ST-3.3T3 be used with ceramic output capacitors?
Yes, MC33375ST-3.3T3 is stable with ceramic output capacitors ≥0.33 µF, including X5R/X7R multilayer types. The datasheet explicitly validates stability with 0.33 µF ceramic, eliminating ESR concerns common in older LDOs-no series resistor or tantalum substitution is needed.
Does MC33375ST-3.3T3 have built-in reverse polarity protection?
No, MC33375ST-3.3T3 does not include reverse polarity protection. Applying negative voltage to Vin or GND may damage the device. External protection-such as a series Schottky diode or PMOS FET-must be added if reverse input is possible in the application.
How does thermal shutdown behave in MC33375ST-3.3T3 during sustained overload?
When junction temperature reaches 150°C, MC33375ST-3.3T3 disables output with no hysteresis. As temperature falls below 150°C, output re-enables-causing visible oscillation in output voltage under constant overload. This cycling protects the die but requires system-level thermal design to avoid repeated tripping.
Is MC33375ST-3.3T3 pin-compatible with other SOT-223 LDOs like MIC5205-3.3YM?
No, MC33375ST-3.3T3 is not pin-compatible with MIC5205-3.3YM. While both use SOT-223, MC33375ST-3.3T3 assigns Pin 4 to ON/OFF control, whereas MIC5205-3.3YM uses Pin 4 as GND. Swapping them would disconnect control logic and compromise regulation-PCB layout redesign is required for substitution.
MC33375ST-3.3T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
MC33375ST-3.3T3 FAQ
1.How can I place an order for MC33375ST-3.3T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33375ST-3.3T3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC33375ST-3.3T3 reliable?
The price and inventory of MC33375ST-3.3T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33375ST-3.3T3 is usually 5 days.
3.What payment methods are accepted for MC33375ST-3.3T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33375ST-3.3T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33375ST-3.3T3?
MC33375ST-3.3T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33375ST-3.3T3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC33375ST-3.3T3?
For technical support, including MC33375ST-3.3T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33375ST-3.3T3 requirements.
6.How does Aetrix verify that MC33375ST-3.3T3 is sourced from the original manufacturer or authorized distributors?
All MC33375ST-3.3T3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33375ST-3.3T3 meets industry standards.
7.What is the process for return or replacement of MC33375ST-3.3T3?
All MC33375ST-3.3T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33375ST-3.3T3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC33375ST-3.3T3 part is unused and in its original packaging.
Return procedure for MC33375ST-3.3T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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